After 30 years, I finally beat DOOM 2

I beat DOOM 64 yesterday. Well, I beat the normal levels, not the Lost Levels or the Fun Levels yet, but I'm ready to move to DOOM 2016 to avoid burnout.

DOOM 64 was definetly slower and more methodical than DOOM II, with more puzzles and such. I kinda liked it, but had to use YouTube guides at some point since some solutions seemed rather obscure. That's the only way I managed to get two of the three Demon Keys.